Add link to vscode settings in Rust repo (#1591)

Author: clubby789

src/building/suggested.md

@@ -28,11 +28,17 @@ of these tools when hacking on `rustc`. For example, `x.py setup` will prompt
 you to create a `.vscode/settings.json` file which will configure Visual Studio code.
 This will ask `rust-analyzer` to use `./x.py check` to check the sources, and the
 stage 0 rustfmt to format them.
+The recommended `rust-analyzer` settings live at [`src/etc/vscode_settings.json`].
 
 If you have enough free disk space and you would like to be able to run `x.py` commands while
 rust-analyzer runs in the background, you can also add `--build-dir build-rust-analyzer` to the
 `overrideCommand` to avoid x.py locking.
 
+If you're running `coc.nvim`, you can use `:CocLocalConfig` to create a
+`.vim/coc-settings.json` and copy the settings from [`src/etc/vscode_settings.json`].
+
+[`src/etc/vscode_settings.json`]: https://github.com/rust-lang/rust/blob/master/src/etc/vscode_settings.json
+
 If running `./x.py check` on save is inconvenient, in VS Code you can use a [Build
 Task] instead: